Cooling System, Checking For Coolant Leaks
Special tools and workshop equipment required
- Cooling System Tester V.A.G 1274 B
- Adapter V.A.G 1274/8
- Adapter V.A.G 1274/9
Procedure
- Engine at operating temperature.
WARNING:
Risk of scalding due to hot steam and hot coolant.
- The coolant system is under pressure when the engine is warm.
- Cover the coolant reservoir cap with a cloth and then open it slowly to release the pressure in the system.
-- Open the coolant reservoir cap.
-- Position the V.A.G 1274 B with V.A.G 1274/8 on coolant reservoir.
-- Generate approximately 1 bar pressure using the cooling system tester hand pump.
-- If pressure falls, search for leaks and correct the problem.
Pressure Relief Valve in Cap, Checking
Fig 2: Connecting Connector Piece V.A.G 1274 B/1 To Cooling System Tester V.A.G 1274 B Using Connecting Hose
-- Attach V.A.G 1274 B with V.A.G 1274/9 to the sealing cap.
-- Generate pressure with cooling system tester hand pump.
- The pressure release valve must open at 1.4 to 1.6 bar.
-- If pressure relief valve does not open as specified, replace cap.